Perception.

That's what it all boils down to. No one here is a mind reader and can honestly claim to know whether so-and-so ducked Joe Blow or the other way around. Only So-and-So and Joe Blow know for sure. But public perception is a reality, like it or not, and I'd say there is a fair amount of public perception that Floyd has avoided Pac more than the other way around.

Does Floyd need to fight Manny? To paraphrase a famous line from Morgan Freeman in the movie "Lean on Me", Floyd doesn't need to do anything but stay black and die. He's had a remarkable career already, and can decide to call it quits, or find other opponents. Will that help the public perception about his avoiding Pac? Of course not. Especially when part of the public perception is that Floyd is protecting his precious "0" even more so that his career is winding down.

To me it doesn't matter when they fight. They gonna fight? Then fight.